Life cycle of single atom catalysts: a Mössbauer study on degradation and reactivation of tetrapyrrolic Fe–N–C powders

Davide Menga; Friedrich E. Wagner; Tim-Patrick Fellinger

doi:10.1039/D3MH00308F

Life cycle of single atom catalysts: a Mössbauer study on degradation and reactivation of tetrapyrrolic Fe–N–C powders†‡

Davide Menga,^a Friedrich E. Wagner^b and Tim-Patrick Fellinger

*^c

Author affiliations

* Corresponding authors

^a Chair of Technical Electrochemistry, Department of Chemistry and Catalysis Research Center, Technische Universität München (TUM), 85748 Garching, Germany

^b Department of Physics, Technische Universität München (TUM), 85748 Garching, Germany

^c Division 3.6 Electrochemical Energy Materials, Bundesanstalt für Materialforschung und -prüfung (BAM), Berlin, Germany
E-mail: tim-patrick.fellinger@bam.de

Abstract

The degradation of a single-site atomically dispersed, model Fe–N–C powder catalyst with high activity is investigated using cryo-Mössbauer spectroscopy. The results indicate a degradation initiated by an Fe²⁺ to Fe³⁺ oxidation due to coordination of oxygen to tetrapyrrolic Fe–N₄ sites at atmospheric conditions (change between characteristic doublets) before iron(III) oxide is formed (sextet). Thermal reactivation can be used to restore substantial catalytic activity of aged Fe–N–C powders.

This article is part of the themed collection: New horizons in materials for energy conversion, optics and electronics

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DOI: https://doi.org/10.1039/D3MH00308F
Article type: Communication
Submitted: 28 Feb. 2023
Accepted: 25 Sep. 2023
First published: 04 Okt. 2023
This article is Open Access

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Mater. Horiz., 2023,10, 5577-5583

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Life cycle of single atom catalysts: a Mössbauer study on degradation and reactivation of tetrapyrrolic Fe–N–C powders

D. Menga, F. E. Wagner and T. Fellinger, Mater. Horiz., 2023, 10, 5577 DOI: 10.1039/D3MH00308F

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

Materials Horizons

Life cycle of single atom catalysts: a Mössbauer study on degradation and reactivation of tetrapyrrolic Fe–N–C powders†‡

Abstract

Supplementary files

Article information

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Life cycle of single atom catalysts: a Mössbauer study on degradation and reactivation of tetrapyrrolic Fe–N–C powders

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